Scheltjens, Werner; Veluwenkamp, Jan Willem (2014): Sound Toll Registers Online as an Instrument for the Study of Shipmaster Communities. The Cases of Pekela and Papenburg 1750-1800, in: Markus A. Denzel, Christina Dalhede, Christina Dalhede, u. a. (Hrsg.), Preindustrial Commercial History: Flows and Contacts between cities in Scandinavia and North Western Europe, Stuttgart, S. 165–196.